2 * Block driver for the VMDK format
4 * Copyright (c) 2004 Fabrice Bellard
5 * Copyright (c) 2005 Filip Navara
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu-common.h"
27 #include "block/block_int.h"
28 #include "qemu/module.h"
29 #include "migration/migration.h"
32 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
33 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
34 #define VMDK4_COMPRESSION_DEFLATE 1
35 #define VMDK4_FLAG_NL_DETECT (1 << 0)
36 #define VMDK4_FLAG_RGD (1 << 1)
37 /* Zeroed-grain enable bit */
38 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2)
39 #define VMDK4_FLAG_COMPRESS (1 << 16)
40 #define VMDK4_FLAG_MARKER (1 << 17)
41 #define VMDK4_GD_AT_END 0xffffffffffffffffULL
43 #define VMDK_GTE_ZEROED 0x1
45 /* VMDK internal error codes */
47 #define VMDK_ERROR (-1)
48 /* Cluster not allocated */
49 #define VMDK_UNALLOC (-2)
50 #define VMDK_ZEROED (-3)
52 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain"
57 uint32_t disk_sectors
;
59 uint32_t l1dir_offset
;
61 uint32_t file_sectors
;
64 uint32_t sectors_per_track
;
65 } QEMU_PACKED VMDK3Header
;
74 /* Number of GrainTableEntries per GrainTable */
75 uint32_t num_gtes_per_gt
;
78 uint64_t grain_offset
;
81 uint16_t compressAlgorithm
;
82 } QEMU_PACKED VMDK4Header
;
84 #define L2_CACHE_SIZE 16
86 typedef struct VmdkExtent
{
87 BlockDriverState
*file
;
95 int64_t flat_start_offset
;
96 int64_t l1_table_offset
;
97 int64_t l1_backup_table_offset
;
99 uint32_t *l1_backup_table
;
100 unsigned int l1_size
;
101 uint32_t l1_entry_sectors
;
103 unsigned int l2_size
;
105 uint32_t l2_cache_offsets
[L2_CACHE_SIZE
];
106 uint32_t l2_cache_counts
[L2_CACHE_SIZE
];
108 int64_t cluster_sectors
;
111 typedef struct BDRVVmdkState
{
113 uint64_t desc_offset
;
118 /* Extent array with num_extents entries, ascend ordered by address */
120 Error
*migration_blocker
;
123 typedef struct VmdkMetaData
{
125 unsigned int l1_index
;
126 unsigned int l2_index
;
127 unsigned int l2_offset
;
129 uint32_t *l2_cache_entry
;
132 typedef struct VmdkGrainMarker
{
136 } QEMU_PACKED VmdkGrainMarker
;
139 MARKER_END_OF_STREAM
= 0,
140 MARKER_GRAIN_TABLE
= 1,
141 MARKER_GRAIN_DIRECTORY
= 2,
145 static int vmdk_probe(const uint8_t *buf
, int buf_size
, const char *filename
)
152 magic
= be32_to_cpu(*(uint32_t *)buf
);
153 if (magic
== VMDK3_MAGIC
||
154 magic
== VMDK4_MAGIC
) {
157 const char *p
= (const char *)buf
;
158 const char *end
= p
+ buf_size
;
161 /* skip comment line */
162 while (p
< end
&& *p
!= '\n') {
169 while (p
< end
&& *p
== ' ') {
172 /* skip '\r' if windows line endings used. */
173 if (p
< end
&& *p
== '\r') {
176 /* only accept blank lines before 'version=' line */
177 if (p
== end
|| *p
!= '\n') {
183 if (end
- p
>= strlen("version=X\n")) {
184 if (strncmp("version=1\n", p
, strlen("version=1\n")) == 0 ||
185 strncmp("version=2\n", p
, strlen("version=2\n")) == 0) {
189 if (end
- p
>= strlen("version=X\r\n")) {
190 if (strncmp("version=1\r\n", p
, strlen("version=1\r\n")) == 0 ||
191 strncmp("version=2\r\n", p
, strlen("version=2\r\n")) == 0) {
201 #define SECTOR_SIZE 512
202 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */
203 #define BUF_SIZE 4096
204 #define HEADER_SIZE 512 /* first sector of 512 bytes */
206 static void vmdk_free_extents(BlockDriverState
*bs
)
209 BDRVVmdkState
*s
= bs
->opaque
;
212 for (i
= 0; i
< s
->num_extents
; i
++) {
216 g_free(e
->l1_backup_table
);
217 if (e
->file
!= bs
->file
) {
224 static void vmdk_free_last_extent(BlockDriverState
*bs
)
226 BDRVVmdkState
*s
= bs
->opaque
;
228 if (s
->num_extents
== 0) {
232 s
->extents
= g_realloc(s
->extents
, s
->num_extents
* sizeof(VmdkExtent
));
235 static uint32_t vmdk_read_cid(BlockDriverState
*bs
, int parent
)
237 char desc
[DESC_SIZE
];
238 uint32_t cid
= 0xffffffff;
239 const char *p_name
, *cid_str
;
241 BDRVVmdkState
*s
= bs
->opaque
;
244 ret
= bdrv_pread(bs
->file
, s
->desc_offset
, desc
, DESC_SIZE
);
250 cid_str
= "parentCID";
251 cid_str_size
= sizeof("parentCID");
254 cid_str_size
= sizeof("CID");
257 desc
[DESC_SIZE
- 1] = '\0';
258 p_name
= strstr(desc
, cid_str
);
259 if (p_name
!= NULL
) {
260 p_name
+= cid_str_size
;
261 sscanf(p_name
, "%x", &cid
);
267 static int vmdk_write_cid(BlockDriverState
*bs
, uint32_t cid
)
269 char desc
[DESC_SIZE
], tmp_desc
[DESC_SIZE
];
270 char *p_name
, *tmp_str
;
271 BDRVVmdkState
*s
= bs
->opaque
;
274 ret
= bdrv_pread(bs
->file
, s
->desc_offset
, desc
, DESC_SIZE
);
279 desc
[DESC_SIZE
- 1] = '\0';
280 tmp_str
= strstr(desc
, "parentCID");
281 if (tmp_str
== NULL
) {
285 pstrcpy(tmp_desc
, sizeof(tmp_desc
), tmp_str
);
286 p_name
= strstr(desc
, "CID");
287 if (p_name
!= NULL
) {
288 p_name
+= sizeof("CID");
289 snprintf(p_name
, sizeof(desc
) - (p_name
- desc
), "%x\n", cid
);
290 pstrcat(desc
, sizeof(desc
), tmp_desc
);
293 ret
= bdrv_pwrite_sync(bs
->file
, s
->desc_offset
, desc
, DESC_SIZE
);
301 static int vmdk_is_cid_valid(BlockDriverState
*bs
)
303 BDRVVmdkState
*s
= bs
->opaque
;
304 BlockDriverState
*p_bs
= bs
->backing_hd
;
307 if (!s
->cid_checked
&& p_bs
) {
308 cur_pcid
= vmdk_read_cid(p_bs
, 0);
309 if (s
->parent_cid
!= cur_pcid
) {
314 s
->cid_checked
= true;
319 /* Queue extents, if any, for reopen() */
320 static int vmdk_reopen_prepare(BDRVReopenState
*state
,
321 BlockReopenQueue
*queue
, Error
**errp
)
328 assert(state
!= NULL
);
329 assert(state
->bs
!= NULL
);
332 error_setg(errp
, "No reopen queue for VMDK extents");
336 s
= state
->bs
->opaque
;
340 for (i
= 0; i
< s
->num_extents
; i
++) {
342 if (e
->file
!= state
->bs
->file
) {
343 bdrv_reopen_queue(queue
, e
->file
, state
->flags
);
352 static int vmdk_parent_open(BlockDriverState
*bs
)
355 char desc
[DESC_SIZE
+ 1];
356 BDRVVmdkState
*s
= bs
->opaque
;
359 desc
[DESC_SIZE
] = '\0';
360 ret
= bdrv_pread(bs
->file
, s
->desc_offset
, desc
, DESC_SIZE
);
365 p_name
= strstr(desc
, "parentFileNameHint");
366 if (p_name
!= NULL
) {
369 p_name
+= sizeof("parentFileNameHint") + 1;
370 end_name
= strchr(p_name
, '\"');
371 if (end_name
== NULL
) {
374 if ((end_name
- p_name
) > sizeof(bs
->backing_file
) - 1) {
378 pstrcpy(bs
->backing_file
, end_name
- p_name
+ 1, p_name
);
384 /* Create and append extent to the extent array. Return the added VmdkExtent
385 * address. return NULL if allocation failed. */
386 static int vmdk_add_extent(BlockDriverState
*bs
,
387 BlockDriverState
*file
, bool flat
, int64_t sectors
,
388 int64_t l1_offset
, int64_t l1_backup_offset
,
390 int l2_size
, uint64_t cluster_sectors
,
391 VmdkExtent
**new_extent
,
395 BDRVVmdkState
*s
= bs
->opaque
;
397 if (cluster_sectors
> 0x200000) {
398 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */
399 error_setg(errp
, "Invalid granularity, image may be corrupt");
402 if (l1_size
> 512 * 1024 * 1024) {
403 /* Although with big capacity and small l1_entry_sectors, we can get a
404 * big l1_size, we don't want unbounded value to allocate the table.
405 * Limit it to 512M, which is 16PB for default cluster and L2 table
407 error_setg(errp
, "L1 size too big");
411 s
->extents
= g_realloc(s
->extents
,
412 (s
->num_extents
+ 1) * sizeof(VmdkExtent
));
413 extent
= &s
->extents
[s
->num_extents
];
416 memset(extent
, 0, sizeof(VmdkExtent
));
419 extent
->sectors
= sectors
;
420 extent
->l1_table_offset
= l1_offset
;
421 extent
->l1_backup_table_offset
= l1_backup_offset
;
422 extent
->l1_size
= l1_size
;
423 extent
->l1_entry_sectors
= l2_size
* cluster_sectors
;
424 extent
->l2_size
= l2_size
;
425 extent
->cluster_sectors
= flat
? sectors
: cluster_sectors
;
427 if (s
->num_extents
> 1) {
428 extent
->end_sector
= (*(extent
- 1)).end_sector
+ extent
->sectors
;
430 extent
->end_sector
= extent
->sectors
;
432 bs
->total_sectors
= extent
->end_sector
;
434 *new_extent
= extent
;
439 static int vmdk_init_tables(BlockDriverState
*bs
, VmdkExtent
*extent
,
445 /* read the L1 table */
446 l1_size
= extent
->l1_size
* sizeof(uint32_t);
447 extent
->l1_table
= g_malloc(l1_size
);
448 ret
= bdrv_pread(extent
->file
,
449 extent
->l1_table_offset
,
453 error_setg_errno(errp
, -ret
,
454 "Could not read l1 table from extent '%s'",
455 extent
->file
->filename
);
458 for (i
= 0; i
< extent
->l1_size
; i
++) {
459 le32_to_cpus(&extent
->l1_table
[i
]);
462 if (extent
->l1_backup_table_offset
) {
463 extent
->l1_backup_table
= g_malloc(l1_size
);
464 ret
= bdrv_pread(extent
->file
,
465 extent
->l1_backup_table_offset
,
466 extent
->l1_backup_table
,
469 error_setg_errno(errp
, -ret
,
470 "Could not read l1 backup table from extent '%s'",
471 extent
->file
->filename
);
474 for (i
= 0; i
< extent
->l1_size
; i
++) {
475 le32_to_cpus(&extent
->l1_backup_table
[i
]);
480 g_malloc(extent
->l2_size
* L2_CACHE_SIZE
* sizeof(uint32_t));
483 g_free(extent
->l1_backup_table
);
485 g_free(extent
->l1_table
);
489 static int vmdk_open_vmfs_sparse(BlockDriverState
*bs
,
490 BlockDriverState
*file
,
491 int flags
, Error
**errp
)
498 ret
= bdrv_pread(file
, sizeof(magic
), &header
, sizeof(header
));
500 error_setg_errno(errp
, -ret
,
501 "Could not read header from file '%s'",
505 ret
= vmdk_add_extent(bs
, file
, false,
506 le32_to_cpu(header
.disk_sectors
),
507 le32_to_cpu(header
.l1dir_offset
) << 9,
509 le32_to_cpu(header
.l1dir_size
),
511 le32_to_cpu(header
.granularity
),
517 ret
= vmdk_init_tables(bs
, extent
, errp
);
519 /* free extent allocated by vmdk_add_extent */
520 vmdk_free_last_extent(bs
);
525 static int vmdk_open_desc_file(BlockDriverState
*bs
, int flags
,
526 uint64_t desc_offset
, Error
**errp
);
528 static int vmdk_open_vmdk4(BlockDriverState
*bs
,
529 BlockDriverState
*file
,
530 int flags
, Error
**errp
)
534 uint32_t l1_size
, l1_entry_sectors
;
537 int64_t l1_backup_offset
= 0;
539 ret
= bdrv_pread(file
, sizeof(magic
), &header
, sizeof(header
));
541 error_setg_errno(errp
, -ret
,
542 "Could not read header from file '%s'",
545 if (header
.capacity
== 0) {
546 uint64_t desc_offset
= le64_to_cpu(header
.desc_offset
);
548 return vmdk_open_desc_file(bs
, flags
, desc_offset
<< 9, errp
);
552 if (le64_to_cpu(header
.gd_offset
) == VMDK4_GD_AT_END
) {
554 * The footer takes precedence over the header, so read it in. The
555 * footer starts at offset -1024 from the end: One sector for the
556 * footer, and another one for the end-of-stream marker.
563 uint8_t pad
[512 - 16];
564 } QEMU_PACKED footer_marker
;
568 uint8_t pad
[512 - 4 - sizeof(VMDK4Header
)];
574 uint8_t pad
[512 - 16];
575 } QEMU_PACKED eos_marker
;
576 } QEMU_PACKED footer
;
578 ret
= bdrv_pread(file
,
579 bs
->file
->total_sectors
* 512 - 1536,
580 &footer
, sizeof(footer
));
585 /* Some sanity checks for the footer */
586 if (be32_to_cpu(footer
.magic
) != VMDK4_MAGIC
||
587 le32_to_cpu(footer
.footer_marker
.size
) != 0 ||
588 le32_to_cpu(footer
.footer_marker
.type
) != MARKER_FOOTER
||
589 le64_to_cpu(footer
.eos_marker
.val
) != 0 ||
590 le32_to_cpu(footer
.eos_marker
.size
) != 0 ||
591 le32_to_cpu(footer
.eos_marker
.type
) != MARKER_END_OF_STREAM
)
596 header
= footer
.header
;
599 if (le32_to_cpu(header
.version
) >= 3) {
601 snprintf(buf
, sizeof(buf
), "VMDK version %d",
602 le32_to_cpu(header
.version
));
603 qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE
,
604 bs
->device_name
, "vmdk", buf
);
608 if (le32_to_cpu(header
.num_gtes_per_gt
) > 512) {
609 error_report("L2 table size too big");
613 l1_entry_sectors
= le32_to_cpu(header
.num_gtes_per_gt
)
614 * le64_to_cpu(header
.granularity
);
615 if (l1_entry_sectors
== 0) {
618 l1_size
= (le64_to_cpu(header
.capacity
) + l1_entry_sectors
- 1)
620 if (le32_to_cpu(header
.flags
) & VMDK4_FLAG_RGD
) {
621 l1_backup_offset
= le64_to_cpu(header
.rgd_offset
) << 9;
623 ret
= vmdk_add_extent(bs
, file
, false,
624 le64_to_cpu(header
.capacity
),
625 le64_to_cpu(header
.gd_offset
) << 9,
628 le32_to_cpu(header
.num_gtes_per_gt
),
629 le64_to_cpu(header
.granularity
),
636 le16_to_cpu(header
.compressAlgorithm
) == VMDK4_COMPRESSION_DEFLATE
;
637 extent
->has_marker
= le32_to_cpu(header
.flags
) & VMDK4_FLAG_MARKER
;
638 extent
->version
= le32_to_cpu(header
.version
);
639 extent
->has_zero_grain
= le32_to_cpu(header
.flags
) & VMDK4_FLAG_ZERO_GRAIN
;
640 ret
= vmdk_init_tables(bs
, extent
, errp
);
642 /* free extent allocated by vmdk_add_extent */
643 vmdk_free_last_extent(bs
);
648 /* find an option value out of descriptor file */
649 static int vmdk_parse_description(const char *desc
, const char *opt_name
,
650 char *buf
, int buf_size
)
652 char *opt_pos
, *opt_end
;
653 const char *end
= desc
+ strlen(desc
);
655 opt_pos
= strstr(desc
, opt_name
);
659 /* Skip "=\"" following opt_name */
660 opt_pos
+= strlen(opt_name
) + 2;
661 if (opt_pos
>= end
) {
665 while (opt_end
< end
&& *opt_end
!= '"') {
668 if (opt_end
== end
|| buf_size
< opt_end
- opt_pos
+ 1) {
671 pstrcpy(buf
, opt_end
- opt_pos
+ 1, opt_pos
);
675 /* Open an extent file and append to bs array */
676 static int vmdk_open_sparse(BlockDriverState
*bs
,
677 BlockDriverState
*file
,
678 int flags
, Error
**errp
)
682 if (bdrv_pread(file
, 0, &magic
, sizeof(magic
)) != sizeof(magic
)) {
686 magic
= be32_to_cpu(magic
);
689 return vmdk_open_vmfs_sparse(bs
, file
, flags
, errp
);
692 return vmdk_open_vmdk4(bs
, file
, flags
, errp
);
700 static int vmdk_parse_extents(const char *desc
, BlockDriverState
*bs
,
701 const char *desc_file_path
, Error
**errp
)
707 const char *p
= desc
;
710 char extent_path
[PATH_MAX
];
711 BlockDriverState
*extent_file
;
714 /* parse extent line:
715 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
717 * RW [size in sectors] SPARSE "file-name.vmdk"
720 ret
= sscanf(p
, "%10s %" SCNd64
" %10s \"%511[^\n\r\"]\" %" SCNd64
,
721 access
, §ors
, type
, fname
, &flat_offset
);
722 if (ret
< 4 || strcmp(access
, "RW")) {
724 } else if (!strcmp(type
, "FLAT")) {
725 if (ret
!= 5 || flat_offset
< 0) {
726 error_setg(errp
, "Invalid extent lines: \n%s", p
);
729 } else if (!strcmp(type
, "VMFS")) {
731 } else if (ret
!= 4) {
732 error_setg(errp
, "Invalid extent lines: \n%s", p
);
737 (strcmp(type
, "FLAT") && strcmp(type
, "SPARSE") &&
738 strcmp(type
, "VMFS") && strcmp(type
, "VMFSSPARSE")) ||
739 (strcmp(access
, "RW"))) {
743 path_combine(extent_path
, sizeof(extent_path
),
744 desc_file_path
, fname
);
745 ret
= bdrv_file_open(&extent_file
, extent_path
, NULL
, bs
->open_flags
,
751 /* save to extents array */
752 if (!strcmp(type
, "FLAT") || !strcmp(type
, "VMFS")) {
756 ret
= vmdk_add_extent(bs
, extent_file
, true, sectors
,
757 0, 0, 0, 0, 0, &extent
, errp
);
761 extent
->flat_start_offset
= flat_offset
<< 9;
762 } else if (!strcmp(type
, "SPARSE") || !strcmp(type
, "VMFSSPARSE")) {
763 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
764 ret
= vmdk_open_sparse(bs
, extent_file
, bs
->open_flags
, errp
);
766 bdrv_unref(extent_file
);
770 error_setg(errp
, "Unsupported extent type '%s'", type
);
774 /* move to next line */
786 static int vmdk_open_desc_file(BlockDriverState
*bs
, int flags
,
787 uint64_t desc_offset
, Error
**errp
)
792 BDRVVmdkState
*s
= bs
->opaque
;
795 size
= bdrv_getlength(bs
->file
);
800 size
= MIN(size
, 1 << 20); /* avoid unbounded allocation */
801 buf
= g_malloc0(size
+ 1);
803 ret
= bdrv_pread(bs
->file
, desc_offset
, buf
, size
);
807 if (vmdk_parse_description(buf
, "createType", ct
, sizeof(ct
))) {
811 if (strcmp(ct
, "monolithicFlat") &&
812 strcmp(ct
, "vmfs") &&
813 strcmp(ct
, "vmfsSparse") &&
814 strcmp(ct
, "twoGbMaxExtentSparse") &&
815 strcmp(ct
, "twoGbMaxExtentFlat")) {
816 error_setg(errp
, "Unsupported image type '%s'", ct
);
821 ret
= vmdk_parse_extents(buf
, bs
, bs
->file
->filename
, errp
);
827 static int vmdk_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
831 BDRVVmdkState
*s
= bs
->opaque
;
833 if (vmdk_open_sparse(bs
, bs
->file
, flags
, errp
) == 0) {
834 s
->desc_offset
= 0x200;
836 ret
= vmdk_open_desc_file(bs
, flags
, 0, errp
);
841 /* try to open parent images, if exist */
842 ret
= vmdk_parent_open(bs
);
846 s
->parent_cid
= vmdk_read_cid(bs
, 1);
847 qemu_co_mutex_init(&s
->lock
);
849 /* Disable migration when VMDK images are used */
850 error_set(&s
->migration_blocker
,
851 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED
,
852 "vmdk", bs
->device_name
, "live migration");
853 migrate_add_blocker(s
->migration_blocker
);
858 vmdk_free_extents(bs
);
862 static int get_whole_cluster(BlockDriverState
*bs
,
864 uint64_t cluster_offset
,
869 uint8_t *whole_grain
= NULL
;
871 /* we will be here if it's first write on non-exist grain(cluster).
872 * try to read from parent image, if exist */
873 if (bs
->backing_hd
) {
875 qemu_blockalign(bs
, extent
->cluster_sectors
<< BDRV_SECTOR_BITS
);
876 if (!vmdk_is_cid_valid(bs
)) {
881 /* floor offset to cluster */
882 offset
-= offset
% (extent
->cluster_sectors
* 512);
883 ret
= bdrv_read(bs
->backing_hd
, offset
>> 9, whole_grain
,
884 extent
->cluster_sectors
);
890 /* Write grain only into the active image */
891 ret
= bdrv_write(extent
->file
, cluster_offset
, whole_grain
,
892 extent
->cluster_sectors
);
899 qemu_vfree(whole_grain
);
903 static int vmdk_L2update(VmdkExtent
*extent
, VmdkMetaData
*m_data
)
906 QEMU_BUILD_BUG_ON(sizeof(offset
) != sizeof(m_data
->offset
));
907 offset
= cpu_to_le32(m_data
->offset
);
908 /* update L2 table */
909 if (bdrv_pwrite_sync(
911 ((int64_t)m_data
->l2_offset
* 512)
912 + (m_data
->l2_index
* sizeof(m_data
->offset
)),
913 &offset
, sizeof(offset
)) < 0) {
916 /* update backup L2 table */
917 if (extent
->l1_backup_table_offset
!= 0) {
918 m_data
->l2_offset
= extent
->l1_backup_table
[m_data
->l1_index
];
919 if (bdrv_pwrite_sync(
921 ((int64_t)m_data
->l2_offset
* 512)
922 + (m_data
->l2_index
* sizeof(m_data
->offset
)),
923 &offset
, sizeof(offset
)) < 0) {
927 if (m_data
->l2_cache_entry
) {
928 *m_data
->l2_cache_entry
= offset
;
934 static int get_cluster_offset(BlockDriverState
*bs
,
936 VmdkMetaData
*m_data
,
939 uint64_t *cluster_offset
)
941 unsigned int l1_index
, l2_offset
, l2_index
;
943 uint32_t min_count
, *l2_table
;
950 *cluster_offset
= extent
->flat_start_offset
;
954 offset
-= (extent
->end_sector
- extent
->sectors
) * SECTOR_SIZE
;
955 l1_index
= (offset
>> 9) / extent
->l1_entry_sectors
;
956 if (l1_index
>= extent
->l1_size
) {
959 l2_offset
= extent
->l1_table
[l1_index
];
963 for (i
= 0; i
< L2_CACHE_SIZE
; i
++) {
964 if (l2_offset
== extent
->l2_cache_offsets
[i
]) {
965 /* increment the hit count */
966 if (++extent
->l2_cache_counts
[i
] == 0xffffffff) {
967 for (j
= 0; j
< L2_CACHE_SIZE
; j
++) {
968 extent
->l2_cache_counts
[j
] >>= 1;
971 l2_table
= extent
->l2_cache
+ (i
* extent
->l2_size
);
975 /* not found: load a new entry in the least used one */
977 min_count
= 0xffffffff;
978 for (i
= 0; i
< L2_CACHE_SIZE
; i
++) {
979 if (extent
->l2_cache_counts
[i
] < min_count
) {
980 min_count
= extent
->l2_cache_counts
[i
];
984 l2_table
= extent
->l2_cache
+ (min_index
* extent
->l2_size
);
987 (int64_t)l2_offset
* 512,
989 extent
->l2_size
* sizeof(uint32_t)
990 ) != extent
->l2_size
* sizeof(uint32_t)) {
994 extent
->l2_cache_offsets
[min_index
] = l2_offset
;
995 extent
->l2_cache_counts
[min_index
] = 1;
997 l2_index
= ((offset
>> 9) / extent
->cluster_sectors
) % extent
->l2_size
;
998 *cluster_offset
= le32_to_cpu(l2_table
[l2_index
]);
1002 m_data
->l1_index
= l1_index
;
1003 m_data
->l2_index
= l2_index
;
1004 m_data
->offset
= *cluster_offset
;
1005 m_data
->l2_offset
= l2_offset
;
1006 m_data
->l2_cache_entry
= &l2_table
[l2_index
];
1008 if (extent
->has_zero_grain
&& *cluster_offset
== VMDK_GTE_ZEROED
) {
1012 if (!*cluster_offset
|| zeroed
) {
1014 return zeroed
? VMDK_ZEROED
: VMDK_UNALLOC
;
1017 /* Avoid the L2 tables update for the images that have snapshots. */
1018 *cluster_offset
= bdrv_getlength(extent
->file
);
1019 if (!extent
->compressed
) {
1022 *cluster_offset
+ (extent
->cluster_sectors
<< 9)
1026 *cluster_offset
>>= 9;
1027 l2_table
[l2_index
] = cpu_to_le32(*cluster_offset
);
1029 /* First of all we write grain itself, to avoid race condition
1030 * that may to corrupt the image.
1031 * This problem may occur because of insufficient space on host disk
1032 * or inappropriate VM shutdown.
1034 if (get_whole_cluster(
1035 bs
, extent
, *cluster_offset
, offset
, allocate
) == -1) {
1040 m_data
->offset
= *cluster_offset
;
1043 *cluster_offset
<<= 9;
1047 static VmdkExtent
*find_extent(BDRVVmdkState
*s
,
1048 int64_t sector_num
, VmdkExtent
*start_hint
)
1050 VmdkExtent
*extent
= start_hint
;
1053 extent
= &s
->extents
[0];
1055 while (extent
< &s
->extents
[s
->num_extents
]) {
1056 if (sector_num
< extent
->end_sector
) {
1064 static int64_t coroutine_fn
vmdk_co_get_block_status(BlockDriverState
*bs
,
1065 int64_t sector_num
, int nb_sectors
, int *pnum
)
1067 BDRVVmdkState
*s
= bs
->opaque
;
1068 int64_t index_in_cluster
, n
, ret
;
1072 extent
= find_extent(s
, sector_num
, NULL
);
1076 qemu_co_mutex_lock(&s
->lock
);
1077 ret
= get_cluster_offset(bs
, extent
, NULL
,
1078 sector_num
* 512, 0, &offset
);
1079 qemu_co_mutex_unlock(&s
->lock
);
1089 ret
= BDRV_BLOCK_ZERO
;
1092 ret
= BDRV_BLOCK_DATA
;
1093 if (extent
->file
== bs
->file
) {
1094 ret
|= BDRV_BLOCK_OFFSET_VALID
| offset
;
1100 index_in_cluster
= sector_num
% extent
->cluster_sectors
;
1101 n
= extent
->cluster_sectors
- index_in_cluster
;
1102 if (n
> nb_sectors
) {
1109 static int vmdk_write_extent(VmdkExtent
*extent
, int64_t cluster_offset
,
1110 int64_t offset_in_cluster
, const uint8_t *buf
,
1111 int nb_sectors
, int64_t sector_num
)
1114 VmdkGrainMarker
*data
= NULL
;
1116 const uint8_t *write_buf
= buf
;
1117 int write_len
= nb_sectors
* 512;
1119 if (extent
->compressed
) {
1120 if (!extent
->has_marker
) {
1124 buf_len
= (extent
->cluster_sectors
<< 9) * 2;
1125 data
= g_malloc(buf_len
+ sizeof(VmdkGrainMarker
));
1126 if (compress(data
->data
, &buf_len
, buf
, nb_sectors
<< 9) != Z_OK
||
1131 data
->lba
= sector_num
;
1132 data
->size
= buf_len
;
1133 write_buf
= (uint8_t *)data
;
1134 write_len
= buf_len
+ sizeof(VmdkGrainMarker
);
1136 ret
= bdrv_pwrite(extent
->file
,
1137 cluster_offset
+ offset_in_cluster
,
1140 if (ret
!= write_len
) {
1141 ret
= ret
< 0 ? ret
: -EIO
;
1150 static int vmdk_read_extent(VmdkExtent
*extent
, int64_t cluster_offset
,
1151 int64_t offset_in_cluster
, uint8_t *buf
,
1155 int cluster_bytes
, buf_bytes
;
1156 uint8_t *cluster_buf
, *compressed_data
;
1157 uint8_t *uncomp_buf
;
1159 VmdkGrainMarker
*marker
;
1163 if (!extent
->compressed
) {
1164 ret
= bdrv_pread(extent
->file
,
1165 cluster_offset
+ offset_in_cluster
,
1166 buf
, nb_sectors
* 512);
1167 if (ret
== nb_sectors
* 512) {
1173 cluster_bytes
= extent
->cluster_sectors
* 512;
1174 /* Read two clusters in case GrainMarker + compressed data > one cluster */
1175 buf_bytes
= cluster_bytes
* 2;
1176 cluster_buf
= g_malloc(buf_bytes
);
1177 uncomp_buf
= g_malloc(cluster_bytes
);
1178 ret
= bdrv_pread(extent
->file
,
1180 cluster_buf
, buf_bytes
);
1184 compressed_data
= cluster_buf
;
1185 buf_len
= cluster_bytes
;
1186 data_len
= cluster_bytes
;
1187 if (extent
->has_marker
) {
1188 marker
= (VmdkGrainMarker
*)cluster_buf
;
1189 compressed_data
= marker
->data
;
1190 data_len
= le32_to_cpu(marker
->size
);
1192 if (!data_len
|| data_len
> buf_bytes
) {
1196 ret
= uncompress(uncomp_buf
, &buf_len
, compressed_data
, data_len
);
1202 if (offset_in_cluster
< 0 ||
1203 offset_in_cluster
+ nb_sectors
* 512 > buf_len
) {
1207 memcpy(buf
, uncomp_buf
+ offset_in_cluster
, nb_sectors
* 512);
1212 g_free(cluster_buf
);
1216 static int vmdk_read(BlockDriverState
*bs
, int64_t sector_num
,
1217 uint8_t *buf
, int nb_sectors
)
1219 BDRVVmdkState
*s
= bs
->opaque
;
1221 uint64_t n
, index_in_cluster
;
1222 uint64_t extent_begin_sector
, extent_relative_sector_num
;
1223 VmdkExtent
*extent
= NULL
;
1224 uint64_t cluster_offset
;
1226 while (nb_sectors
> 0) {
1227 extent
= find_extent(s
, sector_num
, extent
);
1231 ret
= get_cluster_offset(
1233 sector_num
<< 9, 0, &cluster_offset
);
1234 extent_begin_sector
= extent
->end_sector
- extent
->sectors
;
1235 extent_relative_sector_num
= sector_num
- extent_begin_sector
;
1236 index_in_cluster
= extent_relative_sector_num
% extent
->cluster_sectors
;
1237 n
= extent
->cluster_sectors
- index_in_cluster
;
1238 if (n
> nb_sectors
) {
1241 if (ret
!= VMDK_OK
) {
1242 /* if not allocated, try to read from parent image, if exist */
1243 if (bs
->backing_hd
&& ret
!= VMDK_ZEROED
) {
1244 if (!vmdk_is_cid_valid(bs
)) {
1247 ret
= bdrv_read(bs
->backing_hd
, sector_num
, buf
, n
);
1252 memset(buf
, 0, 512 * n
);
1255 ret
= vmdk_read_extent(extent
,
1256 cluster_offset
, index_in_cluster
* 512,
1269 static coroutine_fn
int vmdk_co_read(BlockDriverState
*bs
, int64_t sector_num
,
1270 uint8_t *buf
, int nb_sectors
)
1273 BDRVVmdkState
*s
= bs
->opaque
;
1274 qemu_co_mutex_lock(&s
->lock
);
1275 ret
= vmdk_read(bs
, sector_num
, buf
, nb_sectors
);
1276 qemu_co_mutex_unlock(&s
->lock
);
1282 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature
1283 * if possible, otherwise return -ENOTSUP.
1284 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try
1285 * with each cluster. By dry run we can find if the zero write
1286 * is possible without modifying image data.
1288 * Returns: error code with 0 for success.
1290 static int vmdk_write(BlockDriverState
*bs
, int64_t sector_num
,
1291 const uint8_t *buf
, int nb_sectors
,
1292 bool zeroed
, bool zero_dry_run
)
1294 BDRVVmdkState
*s
= bs
->opaque
;
1295 VmdkExtent
*extent
= NULL
;
1297 int64_t index_in_cluster
;
1298 uint64_t extent_begin_sector
, extent_relative_sector_num
;
1299 uint64_t cluster_offset
;
1300 VmdkMetaData m_data
;
1302 if (sector_num
> bs
->total_sectors
) {
1303 error_report("Wrong offset: sector_num=0x%" PRIx64
1304 " total_sectors=0x%" PRIx64
"\n",
1305 sector_num
, bs
->total_sectors
);
1309 while (nb_sectors
> 0) {
1310 extent
= find_extent(s
, sector_num
, extent
);
1314 ret
= get_cluster_offset(
1318 sector_num
<< 9, !extent
->compressed
,
1320 if (extent
->compressed
) {
1321 if (ret
== VMDK_OK
) {
1322 /* Refuse write to allocated cluster for streamOptimized */
1323 error_report("Could not write to allocated cluster"
1324 " for streamOptimized");
1328 ret
= get_cluster_offset(
1336 if (ret
== VMDK_ERROR
) {
1339 extent_begin_sector
= extent
->end_sector
- extent
->sectors
;
1340 extent_relative_sector_num
= sector_num
- extent_begin_sector
;
1341 index_in_cluster
= extent_relative_sector_num
% extent
->cluster_sectors
;
1342 n
= extent
->cluster_sectors
- index_in_cluster
;
1343 if (n
> nb_sectors
) {
1347 /* Do zeroed write, buf is ignored */
1348 if (extent
->has_zero_grain
&&
1349 index_in_cluster
== 0 &&
1350 n
>= extent
->cluster_sectors
) {
1351 n
= extent
->cluster_sectors
;
1352 if (!zero_dry_run
) {
1353 m_data
.offset
= VMDK_GTE_ZEROED
;
1354 /* update L2 tables */
1355 if (vmdk_L2update(extent
, &m_data
) != VMDK_OK
) {
1363 ret
= vmdk_write_extent(extent
,
1364 cluster_offset
, index_in_cluster
* 512,
1365 buf
, n
, sector_num
);
1370 /* update L2 tables */
1371 if (vmdk_L2update(extent
, &m_data
) != VMDK_OK
) {
1380 /* update CID on the first write every time the virtual disk is
1382 if (!s
->cid_updated
) {
1383 ret
= vmdk_write_cid(bs
, time(NULL
));
1387 s
->cid_updated
= true;
1393 static coroutine_fn
int vmdk_co_write(BlockDriverState
*bs
, int64_t sector_num
,
1394 const uint8_t *buf
, int nb_sectors
)
1397 BDRVVmdkState
*s
= bs
->opaque
;
1398 qemu_co_mutex_lock(&s
->lock
);
1399 ret
= vmdk_write(bs
, sector_num
, buf
, nb_sectors
, false, false);
1400 qemu_co_mutex_unlock(&s
->lock
);
1404 static int coroutine_fn
vmdk_co_write_zeroes(BlockDriverState
*bs
,
1409 BDRVVmdkState
*s
= bs
->opaque
;
1410 qemu_co_mutex_lock(&s
->lock
);
1411 /* write zeroes could fail if sectors not aligned to cluster, test it with
1412 * dry_run == true before really updating image */
1413 ret
= vmdk_write(bs
, sector_num
, NULL
, nb_sectors
, true, true);
1415 ret
= vmdk_write(bs
, sector_num
, NULL
, nb_sectors
, true, false);
1417 qemu_co_mutex_unlock(&s
->lock
);
1421 static int vmdk_create_extent(const char *filename
, int64_t filesize
,
1422 bool flat
, bool compress
, bool zeroed_grain
)
1427 uint32_t tmp
, magic
, grains
, gd_size
, gt_size
, gt_count
;
1429 fd
= qemu_open(filename
,
1430 O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
| O_LARGEFILE
,
1436 ret
= ftruncate(fd
, filesize
);
1442 magic
= cpu_to_be32(VMDK4_MAGIC
);
1443 memset(&header
, 0, sizeof(header
));
1444 header
.version
= zeroed_grain
? 2 : 1;
1445 header
.flags
= VMDK4_FLAG_RGD
| VMDK4_FLAG_NL_DETECT
1446 | (compress
? VMDK4_FLAG_COMPRESS
| VMDK4_FLAG_MARKER
: 0)
1447 | (zeroed_grain
? VMDK4_FLAG_ZERO_GRAIN
: 0);
1448 header
.compressAlgorithm
= compress
? VMDK4_COMPRESSION_DEFLATE
: 0;
1449 header
.capacity
= filesize
/ 512;
1450 header
.granularity
= 128;
1451 header
.num_gtes_per_gt
= 512;
1453 grains
= (filesize
/ 512 + header
.granularity
- 1) / header
.granularity
;
1454 gt_size
= ((header
.num_gtes_per_gt
* sizeof(uint32_t)) + 511) >> 9;
1456 (grains
+ header
.num_gtes_per_gt
- 1) / header
.num_gtes_per_gt
;
1457 gd_size
= (gt_count
* sizeof(uint32_t) + 511) >> 9;
1459 header
.desc_offset
= 1;
1460 header
.desc_size
= 20;
1461 header
.rgd_offset
= header
.desc_offset
+ header
.desc_size
;
1462 header
.gd_offset
= header
.rgd_offset
+ gd_size
+ (gt_size
* gt_count
);
1463 header
.grain_offset
=
1464 ((header
.gd_offset
+ gd_size
+ (gt_size
* gt_count
) +
1465 header
.granularity
- 1) / header
.granularity
) *
1467 /* swap endianness for all header fields */
1468 header
.version
= cpu_to_le32(header
.version
);
1469 header
.flags
= cpu_to_le32(header
.flags
);
1470 header
.capacity
= cpu_to_le64(header
.capacity
);
1471 header
.granularity
= cpu_to_le64(header
.granularity
);
1472 header
.num_gtes_per_gt
= cpu_to_le32(header
.num_gtes_per_gt
);
1473 header
.desc_offset
= cpu_to_le64(header
.desc_offset
);
1474 header
.desc_size
= cpu_to_le64(header
.desc_size
);
1475 header
.rgd_offset
= cpu_to_le64(header
.rgd_offset
);
1476 header
.gd_offset
= cpu_to_le64(header
.gd_offset
);
1477 header
.grain_offset
= cpu_to_le64(header
.grain_offset
);
1478 header
.compressAlgorithm
= cpu_to_le16(header
.compressAlgorithm
);
1480 header
.check_bytes
[0] = 0xa;
1481 header
.check_bytes
[1] = 0x20;
1482 header
.check_bytes
[2] = 0xd;
1483 header
.check_bytes
[3] = 0xa;
1485 /* write all the data */
1486 ret
= qemu_write_full(fd
, &magic
, sizeof(magic
));
1487 if (ret
!= sizeof(magic
)) {
1491 ret
= qemu_write_full(fd
, &header
, sizeof(header
));
1492 if (ret
!= sizeof(header
)) {
1497 ret
= ftruncate(fd
, le64_to_cpu(header
.grain_offset
) << 9);
1503 /* write grain directory */
1504 lseek(fd
, le64_to_cpu(header
.rgd_offset
) << 9, SEEK_SET
);
1505 for (i
= 0, tmp
= le64_to_cpu(header
.rgd_offset
) + gd_size
;
1506 i
< gt_count
; i
++, tmp
+= gt_size
) {
1507 ret
= qemu_write_full(fd
, &tmp
, sizeof(tmp
));
1508 if (ret
!= sizeof(tmp
)) {
1514 /* write backup grain directory */
1515 lseek(fd
, le64_to_cpu(header
.gd_offset
) << 9, SEEK_SET
);
1516 for (i
= 0, tmp
= le64_to_cpu(header
.gd_offset
) + gd_size
;
1517 i
< gt_count
; i
++, tmp
+= gt_size
) {
1518 ret
= qemu_write_full(fd
, &tmp
, sizeof(tmp
));
1519 if (ret
!= sizeof(tmp
)) {
1531 static int filename_decompose(const char *filename
, char *path
, char *prefix
,
1532 char *postfix
, size_t buf_len
, Error
**errp
)
1536 if (filename
== NULL
|| !strlen(filename
)) {
1537 error_setg(errp
, "No filename provided");
1540 p
= strrchr(filename
, '/');
1542 p
= strrchr(filename
, '\\');
1545 p
= strrchr(filename
, ':');
1549 if (p
- filename
>= buf_len
) {
1552 pstrcpy(path
, p
- filename
+ 1, filename
);
1557 q
= strrchr(p
, '.');
1559 pstrcpy(prefix
, buf_len
, p
);
1562 if (q
- p
>= buf_len
) {
1565 pstrcpy(prefix
, q
- p
+ 1, p
);
1566 pstrcpy(postfix
, buf_len
, q
);
1571 static int vmdk_create(const char *filename
, QEMUOptionParameter
*options
,
1575 char desc
[BUF_SIZE
];
1576 int64_t total_size
= 0, filesize
;
1577 const char *adapter_type
= NULL
;
1578 const char *backing_file
= NULL
;
1579 const char *fmt
= NULL
;
1582 bool flat
, split
, compress
;
1583 char ext_desc_lines
[BUF_SIZE
] = "";
1584 char path
[PATH_MAX
], prefix
[PATH_MAX
], postfix
[PATH_MAX
];
1585 const int64_t split_size
= 0x80000000; /* VMDK has constant split size */
1586 const char *desc_extent_line
;
1587 char parent_desc_line
[BUF_SIZE
] = "";
1588 uint32_t parent_cid
= 0xffffffff;
1589 uint32_t number_heads
= 16;
1590 bool zeroed_grain
= false;
1591 const char desc_template
[] =
1592 "# Disk DescriptorFile\n"
1596 "createType=\"%s\"\n"
1599 "# Extent description\n"
1602 "# The Disk Data Base\n"
1605 "ddb.virtualHWVersion = \"%d\"\n"
1606 "ddb.geometry.cylinders = \"%" PRId64
"\"\n"
1607 "ddb.geometry.heads = \"%d\"\n"
1608 "ddb.geometry.sectors = \"63\"\n"
1609 "ddb.adapterType = \"%s\"\n";
1611 if (filename_decompose(filename
, path
, prefix
, postfix
, PATH_MAX
, errp
)) {
1614 /* Read out options */
1615 while (options
&& options
->name
) {
1616 if (!strcmp(options
->name
, BLOCK_OPT_SIZE
)) {
1617 total_size
= options
->value
.n
;
1618 } else if (!strcmp(options
->name
, BLOCK_OPT_ADAPTER_TYPE
)) {
1619 adapter_type
= options
->value
.s
;
1620 } else if (!strcmp(options
->name
, BLOCK_OPT_BACKING_FILE
)) {
1621 backing_file
= options
->value
.s
;
1622 } else if (!strcmp(options
->name
, BLOCK_OPT_COMPAT6
)) {
1623 flags
|= options
->value
.n
? BLOCK_FLAG_COMPAT6
: 0;
1624 } else if (!strcmp(options
->name
, BLOCK_OPT_SUBFMT
)) {
1625 fmt
= options
->value
.s
;
1626 } else if (!strcmp(options
->name
, BLOCK_OPT_ZEROED_GRAIN
)) {
1627 zeroed_grain
|= options
->value
.n
;
1631 if (!adapter_type
) {
1632 adapter_type
= "ide";
1633 } else if (strcmp(adapter_type
, "ide") &&
1634 strcmp(adapter_type
, "buslogic") &&
1635 strcmp(adapter_type
, "lsilogic") &&
1636 strcmp(adapter_type
, "legacyESX")) {
1637 error_setg(errp
, "Unknown adapter type: '%s'", adapter_type
);
1640 if (strcmp(adapter_type
, "ide") != 0) {
1641 /* that's the number of heads with which vmware operates when
1642 creating, exporting, etc. vmdk files with a non-ide adapter type */
1646 /* Default format to monolithicSparse */
1647 fmt
= "monolithicSparse";
1648 } else if (strcmp(fmt
, "monolithicFlat") &&
1649 strcmp(fmt
, "monolithicSparse") &&
1650 strcmp(fmt
, "twoGbMaxExtentSparse") &&
1651 strcmp(fmt
, "twoGbMaxExtentFlat") &&
1652 strcmp(fmt
, "streamOptimized")) {
1653 error_setg(errp
, "Unknown subformat: '%s'", fmt
);
1656 split
= !(strcmp(fmt
, "twoGbMaxExtentFlat") &&
1657 strcmp(fmt
, "twoGbMaxExtentSparse"));
1658 flat
= !(strcmp(fmt
, "monolithicFlat") &&
1659 strcmp(fmt
, "twoGbMaxExtentFlat"));
1660 compress
= !strcmp(fmt
, "streamOptimized");
1662 desc_extent_line
= "RW %lld FLAT \"%s\" 0\n";
1664 desc_extent_line
= "RW %lld SPARSE \"%s\"\n";
1666 if (flat
&& backing_file
) {
1667 error_setg(errp
, "Flat image can't have backing file");
1670 if (flat
&& zeroed_grain
) {
1671 error_setg(errp
, "Flat image can't enable zeroed grain");
1675 BlockDriverState
*bs
= bdrv_new("");
1676 ret
= bdrv_open(bs
, backing_file
, NULL
, 0, NULL
, errp
);
1681 if (strcmp(bs
->drv
->format_name
, "vmdk")) {
1685 parent_cid
= vmdk_read_cid(bs
, 0);
1687 snprintf(parent_desc_line
, sizeof(parent_desc_line
),
1688 "parentFileNameHint=\"%s\"", backing_file
);
1691 /* Create extents */
1692 filesize
= total_size
;
1693 while (filesize
> 0) {
1694 char desc_line
[BUF_SIZE
];
1695 char ext_filename
[PATH_MAX
];
1696 char desc_filename
[PATH_MAX
];
1697 int64_t size
= filesize
;
1699 if (split
&& size
> split_size
) {
1703 snprintf(desc_filename
, sizeof(desc_filename
), "%s-%c%03d%s",
1704 prefix
, flat
? 'f' : 's', ++idx
, postfix
);
1706 snprintf(desc_filename
, sizeof(desc_filename
), "%s-flat%s",
1709 snprintf(desc_filename
, sizeof(desc_filename
), "%s%s",
1712 snprintf(ext_filename
, sizeof(ext_filename
), "%s%s",
1713 path
, desc_filename
);
1715 if (vmdk_create_extent(ext_filename
, size
,
1716 flat
, compress
, zeroed_grain
)) {
1721 /* Format description line */
1722 snprintf(desc_line
, sizeof(desc_line
),
1723 desc_extent_line
, size
/ 512, desc_filename
);
1724 pstrcat(ext_desc_lines
, sizeof(ext_desc_lines
), desc_line
);
1726 /* generate descriptor file */
1727 snprintf(desc
, sizeof(desc
), desc_template
,
1728 (unsigned int)time(NULL
),
1733 (flags
& BLOCK_FLAG_COMPAT6
? 6 : 4),
1734 total_size
/ (int64_t)(63 * number_heads
* 512), number_heads
,
1736 if (split
|| flat
) {
1737 fd
= qemu_open(filename
,
1738 O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
| O_LARGEFILE
,
1741 fd
= qemu_open(filename
,
1742 O_WRONLY
| O_BINARY
| O_LARGEFILE
,
1748 /* the descriptor offset = 0x200 */
1749 if (!split
&& !flat
&& 0x200 != lseek(fd
, 0x200, SEEK_SET
)) {
1753 ret
= qemu_write_full(fd
, desc
, strlen(desc
));
1754 if (ret
!= strlen(desc
)) {
1764 static void vmdk_close(BlockDriverState
*bs
)
1766 BDRVVmdkState
*s
= bs
->opaque
;
1768 vmdk_free_extents(bs
);
1770 migrate_del_blocker(s
->migration_blocker
);
1771 error_free(s
->migration_blocker
);
1774 static coroutine_fn
int vmdk_co_flush(BlockDriverState
*bs
)
1776 BDRVVmdkState
*s
= bs
->opaque
;
1780 for (i
= 0; i
< s
->num_extents
; i
++) {
1781 err
= bdrv_co_flush(s
->extents
[i
].file
);
1789 static int64_t vmdk_get_allocated_file_size(BlockDriverState
*bs
)
1794 BDRVVmdkState
*s
= bs
->opaque
;
1796 ret
= bdrv_get_allocated_file_size(bs
->file
);
1800 for (i
= 0; i
< s
->num_extents
; i
++) {
1801 if (s
->extents
[i
].file
== bs
->file
) {
1804 r
= bdrv_get_allocated_file_size(s
->extents
[i
].file
);
1813 static int vmdk_has_zero_init(BlockDriverState
*bs
)
1816 BDRVVmdkState
*s
= bs
->opaque
;
1818 /* If has a flat extent and its underlying storage doesn't have zero init,
1820 for (i
= 0; i
< s
->num_extents
; i
++) {
1821 if (s
->extents
[i
].flat
) {
1822 if (!bdrv_has_zero_init(s
->extents
[i
].file
)) {
1830 static QEMUOptionParameter vmdk_create_options
[] = {
1832 .name
= BLOCK_OPT_SIZE
,
1834 .help
= "Virtual disk size"
1837 .name
= BLOCK_OPT_ADAPTER_TYPE
,
1839 .help
= "Virtual adapter type, can be one of "
1840 "ide (default), lsilogic, buslogic or legacyESX"
1843 .name
= BLOCK_OPT_BACKING_FILE
,
1845 .help
= "File name of a base image"
1848 .name
= BLOCK_OPT_COMPAT6
,
1850 .help
= "VMDK version 6 image"
1853 .name
= BLOCK_OPT_SUBFMT
,
1856 "VMDK flat extent format, can be one of "
1857 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
1860 .name
= BLOCK_OPT_ZEROED_GRAIN
,
1862 .help
= "Enable efficient zero writes using the zeroed-grain GTE feature"
1867 static BlockDriver bdrv_vmdk
= {
1868 .format_name
= "vmdk",
1869 .instance_size
= sizeof(BDRVVmdkState
),
1870 .bdrv_probe
= vmdk_probe
,
1871 .bdrv_open
= vmdk_open
,
1872 .bdrv_reopen_prepare
= vmdk_reopen_prepare
,
1873 .bdrv_read
= vmdk_co_read
,
1874 .bdrv_write
= vmdk_co_write
,
1875 .bdrv_co_write_zeroes
= vmdk_co_write_zeroes
,
1876 .bdrv_close
= vmdk_close
,
1877 .bdrv_create
= vmdk_create
,
1878 .bdrv_co_flush_to_disk
= vmdk_co_flush
,
1879 .bdrv_co_get_block_status
= vmdk_co_get_block_status
,
1880 .bdrv_get_allocated_file_size
= vmdk_get_allocated_file_size
,
1881 .bdrv_has_zero_init
= vmdk_has_zero_init
,
1883 .create_options
= vmdk_create_options
,
1886 static void bdrv_vmdk_init(void)
1888 bdrv_register(&bdrv_vmdk
);
1891 block_init(bdrv_vmdk_init
);